// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/base/media.h"

#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/metrics/field_trial.h"
#include "base/trace_event/trace_event.h"
#include "media/base/media_switches.h"
#include "media/base/yuv_convert.h"

#if defined(OS_ANDROID)
#include "base/android/build_info.h"
#include "media/base/android/media_codec_util.h"
#endif

#if !defined(MEDIA_DISABLE_FFMPEG)
#include "media/ffmpeg/ffmpeg_common.h"
#endif

namespace media {

// Media must only be initialized once, so use a LazyInstance to ensure this.
class MediaInitializer {
public:
    void enable_platform_decoder_support()
    {
        has_platform_decoder_support_ = true;
    }

    bool has_platform_decoder_support() { return has_platform_decoder_support_; }

private:
    friend struct base::DefaultLazyInstanceTraits<MediaInitializer>;

    MediaInitializer()
    {
        TRACE_EVENT_WARMUP_CATEGORY("audio");
        TRACE_EVENT_WARMUP_CATEGORY("media");

        // Perform initialization of libraries which require runtime CPU detection.
        InitializeCPUSpecificYUVConversions();

#if !defined(MEDIA_DISABLE_FFMPEG)
        // Initialize CPU flags outside of the sandbox as this may query /proc for
        // details on the current CPU for NEON, VFP, etc optimizations.
        av_get_cpu_flags();

        // Disable logging as it interferes with layout tests.
        av_log_set_level(AV_LOG_QUIET);

#if defined(ALLOCATOR_SHIM)
        // Remove allocation limit from ffmpeg, so calls go down to shim layer.
        av_max_alloc(0);
#endif // defined(ALLOCATOR_SHIM)

#endif // !defined(MEDIA_DISABLE_FFMPEG)
    }

    ~MediaInitializer()
    {
        NOTREACHED() << "MediaInitializer should be leaky!";
    }

    bool has_platform_decoder_support_ = false;

    DISALLOW_COPY_AND_ASSIGN(MediaInitializer);
};

static base::LazyInstance<MediaInitializer>::Leaky g_media_library = LAZY_INSTANCE_INITIALIZER;

void InitializeMediaLibrary()
{
    g_media_library.Get();
}

#if defined(OS_ANDROID)
void EnablePlatformDecoderSupport()
{
    g_media_library.Pointer()->enable_platform_decoder_support();
}

bool HasPlatformDecoderSupport()
{
    return g_media_library.Pointer()->has_platform_decoder_support();
}

bool PlatformHasOpusSupport()
{
    return base::android::BuildInfo::GetInstance()->sdk_int() >= 21;
}

bool IsUnifiedMediaPipelineEnabled()
{
    return !base::CommandLine::ForCurrentProcess()->HasSwitch(
        switches::kDisableUnifiedMediaPipeline);
}

bool ArePlatformDecodersAvailable()
{
    return IsUnifiedMediaPipelineEnabled()
        ? HasPlatformDecoderSupport()
        : MediaCodecUtil::IsMediaCodecAvailable();
}
#endif

} // namespace media
